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EDWIN H. CAMP, OF JACKSON, -MICHIGAN.

Letters Patent No. 64,485, dated' May 7, 1867.

HOT-AIR FURNAGE.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDWIN H. CAMP, of Jackson, inthe county of Jackson,and State of Michigan, have invented a new and improved Hot-Air Furnace;and I do hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art to makeand use the same, reference being had to the accompanying drawings,forming part of this specification.

This invention relates to the manner in which the heat-radiating surfaceof the furnace is increased, and

to the manner in which the products of combustion are made to returnthrough the tire-box in a flue; andthe invention consists inconstructing the furnace in a peculiar form, whereby I am enabled toplace in it 'a large number of, vertical air-tubes, and also inproviding a diving-tine for theproducts of combustion, and in thearrangement of plates and dampers by which the smoke and products ofcombustion are controlled in their passage to and from the furnace.

Figure 1 represents a vertical central section of the furnace throughthe line z x of fig. 3.

Figure 2 is a side elevation of the furnace as when ready for use.

Figure 3 is a plan or top View.

Figure 4 is a horizontal section through the line y y of fig. 1.

Similar letters of reference indicate like parts.` l

The design of this arrangement is to heat air for warming buildings. l

A represents the furnace or tire-box. This tire-box extends up aboutone-half the height of the furnace, with a series of air-tubessurrounding it, (seen in figs. 1 and 4, marked a.) B represents anannular section of the furnace, placed above the tire-box, and throughwhich there passes a series of air-tubes, as seen in the drawing, markedC. D is the space within the annular section B. The smoke and productsof combustion pass up from the fire-box through the .section B into theiiue E by the bent tubes F. From the pointof intersection between E andF the smoke and heated gases may pass directly into the chimney, whenthe damper g is open, but E drops down through Athe annular space D andinto the fire-box, out of the side of which it passes, as seen at f, andwhen the damper is closed the smoke is forced to descend through this ueE. It will be noticedthat the inclined plates at the bottom of the spaceD deflect the heated products of combustion, compelling them to passamong the outer tier of tubes c. The damper g is operated by a rod,(seen in g. 24at h.) J represents the furnace door; K is the ash-pit,and L is the ash-pit door. mis the grate. Air, being of itself a badconductor of heat, it is necessary that each particle should come incontact with a heated surface in order to heat it sufficiently forwarming purposes. In this way currents ,of air are set in motion, theheated air is expanded and rises from the heated metallic surface, andgives place to other particles until all theair in the apartment'is thusheated and is ready to be distributed through the building. The sameoperation isA performed by all the air that enters the apartment. Itmust all pass in contact with heated metallic or other surfaces. It istherefore of the first importance, in order to economize fuel andutilize the heat generated, that the heating surface should be as muchextended and large as possible.

The advantages o f this-arrangement in respect to the increased surfaceaiforded by the tubes must be-obvious to all who are acquainted with thesubject. It will be seen 'that the air-tubes are sc placed that theyare'at all times surrounded by the fire and heated products ofcombustion, and where the heat can best be utilized.

What I claim as new, 4and desire to secure by Letters Patent, isi- Thetwo tiers of tubes marked a and c in combination with the space D,substantially as described for the purposes specified, and incombination with the furnace.

I claim the diving-Hue E and the bent tubes F, arranged substantially asdescribed, in combination with a hot-nir furnace.

E. H. CABIP.

Witnesses:

E. M. ALDnIcH, D. C. DE LAuATEn.

